horse-power

The Sailor's Word-Book

A comparative estimate of the capacity of steam-engines, by assuming a certain average effective pressure of steam, and a certain average linear velocity of the piston. The pressure multiplied by the velocity gives the effective force of the engine exerted through a given number of feet per minute; and since the force called a horse-power means 33,000 lbs. acting thus one foot per minute, it follows that the nominal power of the engine will be found by dividing the effective force exerted by the piston, multiplied by the number of feet per minute through which it acts by 33,000.

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